libcxx/test/std/input.output/iostream.format/std.manip/resetiosflags.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <iomanip>
  10
  11 // T1 resetiosflags(ios_base::fmtflags mask);
  12
  13 #include <iomanip>
  14 #include <istream>
  15 #include <ostream>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19
  20 template <class CharT>
  21 struct testbuf
  22     : public std::basic_streambuf<CharT>
  23 {
  24     testbuf() {}
  25 };
  26
  27 int main(int, char**)
  28 {
  29     {
  30         testbuf<char> sb;
  31         std::istream is(&sb);
  32         assert(is.flags() & std::ios_base::skipws);
  33         is >> std::resetiosflags(std::ios_base::skipws);
  34         assert(!(is.flags() & std::ios_base::skipws));
  35     }
  36     {
  37         testbuf<char> sb;
  38         std::ostream os(&sb);
  39         assert(os.flags() & std::ios_base::skipws);
  40         os << std::resetiosflags(std::ios_base::skipws);
  41         assert(!(os.flags() & std::ios_base::skipws));
  42     }
  43     {
  44         testbuf<wchar_t> sb;
  45         std::wistream is(&sb);
  46         assert(is.flags() & std::ios_base::skipws);
  47         is >> std::resetiosflags(std::ios_base::skipws);
  48         assert(!(is.flags() & std::ios_base::skipws));
  49     }
  50     {
  51         testbuf<wchar_t> sb;
  52         std::wostream os(&sb);
  53         assert(os.flags() & std::ios_base::skipws);
  54         os << std::resetiosflags(std::ios_base::skipws);
  55         assert(!(os.flags() & std::ios_base::skipws));
  56     }
  57
  58   return 0;
  59 }